Cron Expression Builder

Build and explain cron schedules with the next run times.

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About the Cron Expression Builder

Understand and build cron schedules. The Toolcenter Cron Expression Builder parses a standard 5-field expression, explains it in plain English, validates each field, shows the next six run times with countdowns, and offers common presets like “weekdays at 8:30am”.

How to use it

1Type a cron expression or pick a preset.
2Read the plain-English description.
3Check the per-field breakdown for errors.
4Review the next six scheduled run times.

Key features

Plain-English translation of any 5-field cron
Per-field validation with error messages
Next six run times with relative countdowns
Common schedule presets
Runs offline

Frequently asked questions

What are the five cron fields?+

Minute, hour, day of month, month and day of week, in that order, separated by spaces.

Does it support ranges and steps?+

Yes. It handles lists (1,15), ranges (1-5), steps (*/15) and combinations of them.

Which cron dialect is this?+

Standard Vixie/POSIX 5-field cron. Seconds fields and named macros like @daily are not parsed.

Is anything uploaded?+

No. Parsing and scheduling math run in your browser.

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